2+1, 3, 4, 2+2, 5, 4, 2+3, 6, 5, 2+4, 6, 7, 2+5, 8, 7, 2+6, 9, 8, 2+7, 9, 10, 2+8, 10, 11, 2+9, 11, 12, 2+10, 13, 12, 2+11, 13, 14.

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